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Related papers: Cominuscule points and Schubert varieties

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We describe the torus-equivariant cohomology of weighted partial flag orbifolds ${\mathrm{w}}\Sigma$ of type $A$. We establish counterparts of several results known for the partial flag variety that collectively constitute what we refer to…

Algebraic Topology · Mathematics 2019-06-14 Haniya Azam , Shaheen Nazir , Muhammad Imran Qureshi

We consider tangent cones of Schubert varieties in the complete flag variety, and investigate the problem when the tangent cones of two different Schubert varieties coincide. We give a sufficient condition for such coincidence, and…

Representation Theory · Mathematics 2017-06-12 Dmitry Fuchs , Alexandre Kirillov , Sophie Morier-Genoud , Valentin Ovsienko

Under the assumption that the base field k has characteristic 0, we compute the algebraic cobordism fundamental classes of a family of Schubert varieties isomorphic to full and symplectic flag bundles. We use this computation to prove a…

Algebraic Geometry · Mathematics 2015-04-30 Thomas Hudson

For a semisimple adjoint algebraic group $G$ and a Borel subgroup $B$, consider the double classes $BwB$ in $G$ and their closures in the canonical compactification of $G$: we call these closures large Schubert varieties. We show that these…

Algebraic Geometry · Mathematics 2007-05-23 Michel Brion , Patrick Polo

An important combinatorial result in equivariant cohomology and $K$-theory Schubert calculus is represented by the formulas of Billey and Graham-Willems for the localization of Schubert classes at torus fixed points. These formulas work…

Algebraic Geometry · Mathematics 2017-11-01 Cristian Lenart , Kirill Zainoulline

We propose a new approach to the multiplication of Schubert classes in the K-theory of the flag variety. This extends the work of Fomin and Kirillov in the cohomology case, and is based on the quadratic algebra defined by them. More…

Combinatorics · Mathematics 2016-09-07 Cristian Lenart

We prove an identity relating the product of two opposite Schubert varieties in the (equivariant) quantum K-theory ring of a cominuscule flag variety to the minimal degree of a rational curve connecting the Schubert varieties. We deduce…

Algebraic Geometry · Mathematics 2018-01-31 Anders Skovsted Buch , Sjuvon Chung

The purpose of the present notes is to give a self-contained exposition on the use of the techniques of Nil-Hecke algebras in the localization approach to the equivariant Schubert calculus for cohomology of flag varieties. We also…

Algebraic Geometry · Mathematics 2023-10-03 Edward Richmond , Kirill Zainoulline

We prove that Schubert and Richardson varieties in flag manifolds are uniquely determined by their equivariant cohomology classes, as well as a stronger result that replaces Schubert varieties with closures of Bialynicki-Birula cells under…

Algebraic Geometry · Mathematics 2025-08-27 Anders S. Buch , Pierre-Emmanuel Chaput , Nicolas Perrin

Horospherical Schubert varieties are determined. It is shown that the stabilizer of an arbitrary point in a Schubert variety is a strongly solvable algebraic group. The connectedness of this stabilizer subgroup is discussed. Moreover, a new…

Algebraic Geometry · Mathematics 2024-09-10 Mahir Bilen Can , S. Senthamarai Kannan , Pinakinath Saha

We give an explicit combinatorial description of the multiplicity as well as the Hilbert function of the tangent cone at any point on a Schubert variety in the symplectic Grassmannian.

Representation Theory · Mathematics 2011-02-10 Sudhir R. Ghorpade , K. N. Raghavan

We generalize the classification of isomorphism classes of Schubert varieties in complete flag varieties G/B to a class of partial flag varieties G/P. In particular, we classify all Schubert varieties in G/P where P is a minimal parabolic…

Combinatorics · Mathematics 2025-11-25 Yanjun Chen

We give an algorithm to compute the integer cohomology groups of any real partial flag manifold, by computing the incidence coefficients of the Schubert cells. For even flag manifolds we determine the integer cohomology groups, by proving…

Geometric Topology · Mathematics 2019-10-25 Ákos K. Matszangosz

We derive explicit Pieri-type multiplication formulas in the Grothendieck ring of a flag variety. These expand the product of an arbitrary Schubert class and a special Schubert class in the basis of Schubert classes. These special Schubert…

Combinatorics · Mathematics 2010-03-29 Cristian Lenart , Frank Sottile

In this note, we discuss the flexibility of Schubert classes in homogeneous varieties. We give several constructions for representing multiples of a Schubert class by irreducible subvarieties. We sharpen [R, Theorem 3.1] by proving that…

Algebraic Geometry · Mathematics 2013-03-04 Izzet Coskun , Colleen Robles

We obtain an algorithm computing the Chern-Schwartz-MacPherson (CSM) classes of Schubert cells in a generalized flag manifold G/B. In analogy to how the ordinary divided difference operators act on Schubert classes, each CSM class of a…

Algebraic Geometry · Mathematics 2019-02-20 Paolo Aluffi , Leonardo C. Mihalcea

We answer some questions related to multiplicity formulas by Rosenthal and Zelevinsky and by Lakshmibai and Weyman for points on Schubert varieties in Grassmannians. In particular, we give combinatorial interpretations in terms of…

Algebraic Geometry · Mathematics 2007-05-23 Christian Krattenthaler

We classify all products of flag varieties with finitely many orbits under the diagonal action of the general linear group. We also classify the orbits in each case and construct explicit representatives. This generalizes the classical…

Algebraic Geometry · Mathematics 2016-09-07 Peter Magyar , Jerzy Weyman , Andrei Zelevinsky

We describe a method of computing equivariant and ordinary intersection cohomology of certain varieties with actions of algebraic tori, in terms of structure of the zero- and one-dimensional orbits. The class of varieties to which our…

Algebraic Geometry · Mathematics 2007-05-23 Tom Braden , Robert MacPherson

Cominuscule flag varieties generalize Grassmannians to other Lie types. Schubert varieties in cominuscule flag varieties are indexed by posets of roots labeled long/short. These labeled posets generalize Young diagrams. We prove that…

Combinatorics · Mathematics 2024-03-26 Edward Richmond , Mihail Tarigradschi , Weihong Xu